Proline

Proline is the basic unit of protein. It is one of the 21 amino acids that make up human proteins. Except for proline amino acids, which are sub-amino acids, other amino acids are alpha amino acids. The amino acids that make up the protein molecule are all L-amino acids, but it has been confirmed in recent years that they can be isomerized into D-amino acids, and the specific mechanism has not been studied.